Metal working machine



1366- 1942. H. G. KELLOGG ET AL METAL WORKING MACHINE Filed May 13, 1940 2 Sheets-Sheet 1 Dec; 15, 1942. q KELLQGG AL 2,305,354

METAL WORKING MACHINE Filed May 13, 1940 2 Sheets-Sheet 2 v INVENTORS" HOMER s. KELLOGG FRANK RSI s ATTORNEY Patented Dec. 15, 1942 METAL WORKING MACHINE Homer G. Kellogg and Frank P. Sims, Detroit,

Mich, assignors to Motor Products Corporation, Detroit, Mich, a. corporation of New York Application May 13, 1940, Serial No. 334,880

9 Claims.

This invention relates generally to metal working machines and refers more particularly to a machine for forming a frame of predetermined shape from a strip of stock.

Although machines forming the subject matter of this invention may be advantageously used to form frames of various different shapes from a strip of stock, nevertheless, for the purpose of illustration, we have selected a machine capable of fashioning a three sided frame of the type commonly installed on the pivoted panels of composite vehicle body ventilating windows.

One method employed in the manufacture of window frames of the above type consists in rolling a strip of stock to the desired cross sectional contour in a rolling machine having a bending fixture at the delivery end periodically operable to impart the desired bend in the stock as it leaves the last set of forming rolls. Upon completion of the bending operation, the machine is stopped to discontinue advancement of the stock and the bent portion is severed from the remainder of the stock.

One of the most serious objections to ma-' chines operating on the above general principle to form three sided frames of the character briefly set forth is the difficulty encountered in controlling the point of cutoff of the stock so that the side of the frame adjacent the cut end will correspond in length to the edge of the window panel it is adapted to engage. This is due to the varying degrees of overrun or coasting of the machine after the power is discontinued and before the cutoff mechanism actually operates to sever the bent end of the stock from the remainder of the latter. In other words, before the cutoff mechanism actually engages the stock, the latter is advanced by the inertia of the parts of the machine beyond the predetermined point of cutoff and the adjacent side of the frame will, of course, vary in dependence upon the extent of advancement of the stock after the power is discontinued. In some cases, this variation in the length of the frame is sufficient to require a separate operation to reduce the length of the side of the frame to the proper size. rate of production of the-frames is decreased and the cost of manufacture is accordingly increased.

It is one of the principal objects of this invention to overcome the above objection by providing means operable in timed relation to the operation of the bending fixture to automatically sever the bent portion of the stock from the remainder of the latter at a preselected point and insure forming the length of the adjacent side of the As a result, the' frame to the desired dimension regardless of further advancement of the stock by the inertia of the various parts of the machine.

Another object of this invention resides in the novel means provided for automatically operating the cutoff mechanism after the power to the machine has been discontinued and also in the means for initiating the operation of the cutoff mechanism in timed relation to the operation of the bending fixture.

A further advantageous feature of this invention consists in the provision of a machine of the type previously set forth embodying means preventing the operationof both the bending fixture and rolling units during the operation of the cutoff mechanism.

In addition to the foregoing, the present invention contemplates means for rendering the machine inoperative until the cutoff mechanism has completed its operation and has assumed a position out of the path of travel of the stock.-

The foregoing, as well as other objects, will be made more apparent as this description proceeds, especiallywhen considered in connection with the accompanying drawings, wherein:

Figure 1 is a semi-diagrammatic side elevational View of a portion of a metal working machine equipped with the improvements forming the subject matter of this invention;

Figure 2 is a fragmentary plan view of the construction shown in Figure 1;

Figure 3 is an enlarged elevational View of the cutoff mechanism shown in Figure 1 and having certain parts broken away for the sake of clearness;

Figure 4 is a sectional view taken substantially on the plane indicated by the line 4-4 of Figure 3;

Figure 5 is a cross sectional view talen on the plane indicated by the line 5--5 of Figure 1;

Figure 6 is a cross sectional View taken on the plane indicated by the lined-4i of Figure 3;

Figure 7 is a fragmentary elevational view showing the relative position of the parts during the bending operation;

Figure 3 is a side elevational View of a pivoted ventilating panel having a frame fashioned from the machine illustrated in Figure 1;'

Figure 9 is a sectional View taken substantially on the plane indicated by the line 9-9 of Figure 8;

Figure 10 is a cross sectional view taken on the plane indicated by the line l0l0 of Figure 3.

It will be understood as this description prothe rear end of the arm [6.

ceeds that the present invention may be advantageously employed in the manufacture of different types of frames or frame members having varying cross sectional contours, as well as different longitudinal contours. However, for the purpose of illustrating the present invention, we have selected a machine for fashioning a channel-shaped window frame of the type commonly used in connection with the pivoted panel of a vehicle body ventilating window.

In Figure 8 of the drawings, we have illustrated a typical ventilator panel A having a frame B of substantially channel-shaped cross section extending along the bottom, front and top edges thereof. The frame B is not equipped with a portion for engaging the rear edge of the panel A since this latter edge is usually engaged by a division bar either permanently secured in the window opening or carried by the front edge of the vertically slidable panel of the composite window.

Referring now more in detail to the machine for making the frame B, it will be noted that there is-diagrammatically illustrated in Figure 1 a portion of a rolling machine I!) comprising a plurality of sets of forming rolls ll cooperating with each other to form a strip of flat stock to a predetermined cross sectional contour. In the present instance, the several sets of cooperating forming rolls I I are shaped to progressively form the strip of stock to the channel-shaped cross sectional contour illustrated in Figure 9.

The particular construction of the rolling machine forms no part of the present invention and it will suflice to point out herein that the forming rolls are driven by a suitable prime mover, such as an electric motor l2, having the drive shaft thereof operatively connected to the severa] sets of forming rolls through the medium of gearing I3. The arrangement is such that the forming rolls not only cooperate with one another to fashion the strip of stock to the predetermined cross sectional contour, but also function to advance the strip of stock through the 7 machine.

The last set of forming rolls is designated in Figure l by the reference character 14 and as the stock leaves this set of forming rolls, it is engaged by a bending fixture l suitably mounted on the machine at the delivery end of the latter. The bending fixture l5 periodically operates to bend the stock to the longitudinal contour illustrated in Figure 8, and this operation is effected automatically by the mechanism about to be described.

Bending fixture In detail, the bending fixture I5 is provided with an arm l6 having one end pivotally supported for swinging movement in a vertical plane and having a guide I! intermediate the ends adapted to receive the stock as it is advanced beyond the last set of forming rolls M. Upon reference to Figure 1, it will be noted that the 22 and having a peripheral portion engageable with an adjustable cam follower 23 carried by The cam 2| is rotated at the proper speed by means of a gear 24 suitably secured to the revoluble shaft 22 and adapted to mesh with the gearing I3. The peripheral configuration of the cam 2| is so selected that it will impart to the arm It: a rocking movement about the axis of the lower forming roll l9 of the last set M so as to bend the stock to the desired longitudinal contour which, in the present embodiment of the invention, involves a shape substantially as suggested in Figure 8 of the drawings. As will be noted from Figure 1, the portion 25 of the peripheral surface of the cam forms the abrupt bend, 26 of the frame B and the portion 21 of the cam surface forms the gradually curved front side 28 of the frame. On the other hand, the portion 29 of the cam surface, intermediate the two portions aforesaid, cooperates with the arm is to form the substantially straight top edge 30 of the frame.

Cutoff mechanism Upon completion of the operation of the bending fixture to bend the strip of stock to the general contour illustrated in Figure 8, the bent portion of the stock is severed from the remainder of the stock by suitable cutoff mechanism. This mechanism comprises a revoluble knife 3| having diametrically opposed radially outwardly extending blades 32 normally positioned by a stop S in a vertical plane to one side of the path of travel of the stock. As will be more fully hereinafter described, the stop S is in the form of a flexible finger displaceable by the blades 32 as the knife revolves in a clockwise direction and forms a positive stop preventing rotation of the blades in the opposite direction. As shown in Figures 3 and 5, the knife 3| is carried by a guide plate 33 for rotation against the rear side of this plate. In Figure 5 of the drawings, the plate 33 is shown as having a slot 34 corresponding in shape to the cross sectional contour of the stock delivered by the last set of forming rolls l4 and adapted to receive the stock. The slot 34 is positioned in the path of rotation of the'blades 32 on the knife so that rotation of the latter relative to the plate 33 causes one of the blades 32 to sever the stock in a plane including the rear face of the plate 33.

The guide plate 33 and the knife 3| carried thereby are mounted on the arm [6 for swinging movement as a unit with the latter. Upon reference to Figures 1 and 2, it will be noted that the plate 33 is slidably mounted on a shaft 35 having the rear end secured to the arm l6 by means of a bracket 36 and having the forward end secured to the guide portion I! of the arm I6. The plate 33 is apertured to slidably receive the portion of the shaft 35 between the bracket 36 and the guide portion IT. The plate 33 is also slidably connected to the guide portion 11 the plate 33. together with the knife 3|, are not only mounted on the arm l6 for swinging movement as a unit therewith, but are also supported on the arm for sliding movement in the direction of advancement of the stock. This sliding movement is important in the operation of the machine and the purpose of this movement will be more fully hereinafter set forth.

It has previously been stated that the knife 3| is rotatably mounted on the guide plate 33. Upon reference to Figure 3, it will be noted that the knife 3| is provided with an elongatedrearwardly extending tubular hub 46 having an axially extending bore 4| for receiving the shank 42 of a suitable stud and having the rear end portion counterbored to provide an enlarged bore. 43 for receiving the head 44 of the stud. The stud is inserted into the hub through the rear end of the latterand the shank 42 threadedly engages a tapped opening formed in the plate 33. When the stud is secured in place, the head 44 abuts the annular shoulder 45 formed by the counterbored portion 43 and a lock nut 46 is threaded on the free end of the stud to prevent accidental loosening of the stud. It will, of course, be understood that care is taken when securing the stud in place to provide free rotation of the knife against the adjacent surface of the plate 33.

As will be more fully hereinafter set forth, the knife 3| is rotated relative to the plate 33 to sever the stock after the power to the prime mover I2 is discontinued and rotation of the knife is effected by the following mechanism. Upon reference to Figure 3, it will be noted that a relatively long coil spring 56 is supported in a housing which, in turn, is fixedly secured to the frame of the machine in alignment with the path of travel of the strip of stock through the machine. The forward end of the coil spring is arranged in abutting engagement with the rear end of a coupling 52 rotatably supported in the forward end of the housing 5| and held in assembled relation with the housing by means of a sectional plate 53 secured to the front end of the housing by means of fastener elements 54. The coupling is provided with a forwardly extending projection 55 having a reducedportion extending through a cylindrical opening formed in the sectional plate 53 and terminating in a flat head 56 adapted to engage in a transversely extending slot 51 formed in the rear end of the hub 40 on the knife. It will be observed from Figure 4 that the arrangement is such as to provide a driving connection between the spring 5!] and the knife 3|. It may also be pointed out at this time that the slot 51 extends from one side of the hub 4|] to the other and freely receives the head 56 so as to permit the hub 40 of the knife to be readily disconnected fromthe coupling 52 during the bending operation.

Referring again to Figures 3 and 4, it will be.

noted that a plug 51' is secured to the forward end of the spring 5|] and is provided with a transversely elongated key 58 at the forward end adapted to engage'in a slot 59 formed in the coupling 52. provided between the forward end of the spring 50 and the coupling 52. The spring 50 is assembled in the housing 5| under torsional strain and tends to rotate the knife through the coupling 52 in a counterclockwise direction or, in other words, in a direction to urge one of the blades 32 of the knife 3| against the stop S.

Although the stops prevents rotation of the knife in a counterclockwise direction, it will 'be noted that some means must be provided to prevent rotation of the projection 55 in a counterclockwise direction by the spring 50 when the bending fixture and cutoff device are in the positions thereof shown in Figure '7. This means must also hold the head 56 on the coupling 52 in a vertical position for engagement in the slot 51 when the bending fixture is returned to its operative position shown in Figure 1. ,In the present instance, the aforesaid means comprises a projection 6|] formed on the front face of the As a result, a driving connection is coupling. 52 .at one side of the projection 55 and engageable in a recess 6| formed in' the adjacent surface of the plate 53. I Upon reference to Figure 10, it will be noted that the cooperating interengaging projection and recess are so positioned with respect to the axis of rotation of the coupling 52 that the head 56 is held in a vertical plane and, since the slot 51 in the rear end of the hub on the knifev 3| is held in a vertical position by engagement of. one of the blades .32 with the stop S, it follows that the slot will effectively engage the head 56 when the bending fixture is returned from the position shown in Figure 7 to the position shown in Figure 1.

During the operation of the bending fixture, the spring 56 is placed under a, torsional stress in a direction tending to rotate the coupling 52 and knife 3| in a clockwise direction to sever the stock. The spring is normally prevented from rotating the knife 3| in a clockwise direction by a second projection formed on the coupling 52 diametrically opposed to the projection 66 and engageable in a recess 6| formed inthe plate 53. The rear end of the spring 50 is secured to a ratchet wheel 62. Upon reference to Figure 6, it will be noted that the. rear end of the spring 50 is prevented from rotating in a counterclockwise direction by a holding dog 64 pivotally mounted on the machine frame below the ratchet wheel and normally urged into engagement with the radially extending abrupt sides of the teeth on the ratchet wheel by means of a suitable spring 65. Accidental rotation of the wheel in the 0pposite direction is resisted by a second dog 66 pivotally mounted on the machine frame and successively engageable with the sides of the teeth opposite the sides engaged by the holding dog 64. The dog 66 is automatically moved out of operative engagement with the ratchet wheel upon advancement of the wheel to place the spring 5|) under a torsional strain.

In the present instance, the rear end of the spring is rotated by the ratchet wheel 62 relative to the forward end of the spring after each operation of the knife 3| to place the spring under sufficient torsional stress to rotate the knife and sever the stock. This is accomplished by means of a cam 61 secured to the shaft 22 adjacent the cam 21 and having a plurality of recesses 68 in the periphery thereof spaced from each other and adapted to successively receive a suitable cam follower 69. The cam follower 651s mounted on a lever 10 intermediate the ends of the latter and the forward end of the lever 16 is pivotally connected to the machinev frame by means of a pivot pin H. The rearend of the lever is pivotally connected to the lower end of an arm 12 having the upper end pivotally connected to the swinging end of the dog 66 upon initial rotation of the cam from the position thereof shown in Figure 1. The arm 12 is guided in its upward movement by means of a link 13 having one end pivotally connected to the machine frame and having the other end pivotally connected to the arm 12 intermediate the ends of the latter. In addition, the arm 12 carries an advancing dog 14 normally urged into operative relationship with the ratchet wheel 62 by means of a suitable spring 15. The free end of the advancing dog 14 engages the abrupt or radially extending side of one of the ratchet teeth and functions to rotate the ratchet wheel in a clockwise direction, indicated by the arrow 16 in Figure 3.

It follows from the above that during one complete revolution of the cam 61, the torsion spring 50 is successively wound in dependence upon the number of recesses 68 in the periphery of the cam 61.

It will, of course, be understood from the foregoing that in order to effect rotation of the knife 3|, the projections 6|] on the coupling 52 must be released from the recesses 6| in the sectional plate 63. This function is accomplished upon completion of the bending operation and during the interval the supporting plate 33 and knife 3| are moved in the direction of advancement of the stock. In detail, it will be noted from Figure 1 that a lever 16 is pivotally supported intermediate the ends on the machine frame in a position to locate the upper end of the lever immediately in rear of the supporting plate 33 and to locate the lower end of the lever adjacent the periphery of the cam 2|. The lever 16 is swung about its pivotal connection in a direc. tion to engage the upper end with the supporting plate 33 and move the latter together with a knife in the direction of advancement of the stock by means of a cam element 1! adjustably secured to one side of the cam in a position to engage a correspondingly shaped cam element 18 on the lower end of the lever 16.

The cam element 1'! is located in such a position on the cam 2| to engage the cam element 18 on the lever 76 after the stock is bent to the predetermined desired longitudinal contour. It will, of course, be understood that as the face 79 on the cam element 1.! engages the face 8|] on the cam element 18, the upper end of the lever 16 is moved rearwardly and effects a corresponding rearward movement of the supporting plate 33 and knife 3|. The period of engagement between the two cam elements may be varied by adjusting either or both of the cam elements relative to their respective supporting members and, as a result, the length of the side 30 of the frame may be varied.

As the supporting plate 33 and knife 3| are moved rearwardly, the coupling 55 is correspondingly moved rearwardly relative to the sectional plate 53. The extent of rearward movement of the sectional plate 53 is sufficient to disengage the projections 60 from their respective notches 6| and permit the torsional energy stored up in the spring 53 to rotate the knife 3| relative to the supporting plate 33. As a result, the bent portion of the stock is severed from the remainder of the stock by the top blade 32 on the knife and the bottom blade assumes the top position in readiness for the next cutting operation. As the bottom blade moves to its top position, the stop S is flexed upwardly by the free end of this blade and returns to its operative position as soon as the free end of the latter blade is moved beyond the stop. The arrangement is such that the stop positively positions the knife after each cutting operation and prevents the reaction of the spring from rotating the knife in a counterclockwise direction.

It may be pointed out at this time that the spring 50 is compressed to some extent when the coupling 52 is moved rearwardly and, in order to prevent the reactive force of the spring from clamping the knife against the plate 33, we provide means wherein this force is transferred to the supporting plate 33 through the medium of the stud. As shown in Figure 3, a plug 8i] is located in the counterbore 43 of the hub 40 in such a position that one end of the plug engages the head 44 of the stud and the opposite end of the plug abuts the head 56 on the coupling 52.

In the present instance, the power to the prime mover I2 is discontinued during the operation of the knife to sever the stock and cannot be started until the knife assumes its inoperative position to one side of the path of travel of the stock. For accomplishing this result, a switch 8| is electrically connected in series with the motor circuit and comprises a fixed electrical contact 82 and a spring contact 83. Upon reference to Figure 5, it will be noted that the switch is positioned on the supporting plate 33 with the flexible contact member 83 located directly below the path of travel of the blades 32. The arrangement is such that when the blades 32 are in their upright positions or, in other words, are in a vertical plane, the switch 8| is closed and as soon as the knife is rotated from this position, the switch automatically opens with the result that the operation of the prime mover is discontinued.

It will be noted that discontinuing the operation of the prime mover stops further advancement of the stock. However, the inertia of the parts on the machine tend to advance the stock to some extent after the operation of the prime mover is discontinued and this is objectionable because it renders it difficult to form the side 3!] of the frame to the desired length. This objection is overcome with the present arrangement since any overadvancement of the stock caused by coasting of the parts of the machine after the power is discontinued effects a corresponding advancement of the knife. It follows, therefore, that the stock will be severed at the desired predetermined point and, accordingly, the length of the side of the frame 30 may be accurately formed to correspond to the adjacent side of the panel engaged by the frame.

Operation ing to rotate the forward end in a clockwise direction. As the cam 2| continues its rotation in the direction of the arrow 84, the relatively abrupt surface 25 on the periphery of the cam engages the follower 23 on the bending fixture 5 and forms the relatively short bend 26 in the stock around the upper forming roll 20. The stock is, of course, advancing in timed relation to the rota-tion of the cam and the bending fixture continues to operate in dependence upon the contour of the periphery of the cam to bend the stock to the longitudinal shape illustrated in Figure 8.

Upon completion of the bending operation, the cam element 11 on the cam 2| engages the cam element 18 on the lower end of the lever 16 and operates the latter to effect a rearward movement of the support 33 in the direction of advancement of the stock. Inasmuch as the knife 3| is secured to the plate 33, it follows that this knife moves as a unit with the plate. Rearward movement of the knife 3| effects a corresponding rearward movement of the coupling 52 to disengage the projections 60 on the coupling from the recesses 6| in the sectional plate 53. As a result, the forward end of the spring 50 is released and the latteris rotated'in a .clockwisedirection.

As pointed out above, the forward end orthe spring has a driving connection with the knife 3| through the coupling 55 and, as a consequence, the knife is rotated by the Spring 59. Initia1 rotation of the knife from its inoperative position discontinues the operation of .the prime mover so that by the time the top blade 32 of the knife contacts the stock to sever the same, the advancement of the latter ha ceased. In the event, however, that the inertia of the parts of the machine continues the advancement of the stock after the switch 81 is opened by the knife, the latter is moved as a unit with the stock so that the length of the adjacent sid of the frame is not affected.

As soon as the stock is severed by the top blade 32, th bottom blade is positioned by the stop S in readiness for the neXt cutting operation and the switch 8| is closed by the top blade to again start the prime mover I2. As a result, the cam 2| continues its movement inthe direction of the arrow .84 and advances the cam element TI out of registration with the cam element 18. When the two cam elements are out of registration, the spring 59 reacts against the coupling 52 and returns the supporting Plate 33, together with the knife 3|, to their original forwardmost positions on the bending fixture l5. During this operation, the projections 68 on the coupling member are returned to their operative positions with respect to the recesses El in the fixed sectional plate 53 so that the forward end of the spring is again locked preparatory to restoring its torsional effort by operation of the ratchet wheel 62 in the manner previously discussed.

What we claim as our invention is:

1. In a metal working machine, power means for advancing a strip of stock along a predetermined path of travel, a revoluble cutoff device supported to one side of the path of travel of the stock and having an outwardly projecting portion movable across the path of travel of the stock to sever the latter, and a torsion spring operatively connected to the cutoff device for rotating the same.

2. In a metal working machine, power means for advancing a strip of stock along a predetermined path of travel, a revoluble cutoff device supported to one side of the path of travel of the stock and having an outwardly projecting portion movable across the path of travel of the stock to sever the latter, a torsion spring having one end operatively connected to the cutoff device for rotating the same, latch means normally preventing rotation of the cutoff device by said spring, means for releasing said latch means to permit said spring to rotate the cutoff device, and means operated by the cutoff device upon initial movement of the projecting portion on the latter toward th stock to render said power means inoperative.

3. In a metal working machine, power means for advancing a strip of stock along a predetermined path of travel, a revoluble cutoff device supported to one side of the path of travel of the stock for movement in the direction of advancement of the stock and having a portion movable across the path of travel of the stock to sever the latter, a torsion spring having one end connected to the cutoff device for rotating the latter, latch means normally preventing rotation of the cutoff device by said spring, and means responsive to movement of the cutoff device in the direction of advancement of the stock to release said latch means.

4. In a metal working machine, power means for advancing a strip of stock along a predetermined path of travel, a revoluble cutoff device supported to one side of the path of travel of the stock and having a portion movable across the path of travel of the stock to sever the'latter, a torsion spring having one end operatively connected to the cutoff device for rotating the same, latch .means normally preventing operation of th spring to rotate thecutoff device, means for releasing said latch means to effect rotation of the cutoff device, and means operated by the cutoff device prior to engagement of the latter with the stock to discontinue the operation of the power means and to render said power means operative upon completion of the severing operation.

5. In a metal working machine, power means for advancing a strip of stock along a predetermined path of travel, a revoluble cutoff device supported to one side of the path of travel of the stock and having a portion movable across the path of travel of the stock to sever the latter, a torsion spring having one end operatively connected to the cutoff device for rotating the latter, latch means normally preventing operation of the spring to rotate the cutoff device and releasable in timed relation to advancement of the stock, and means operating in timed relationto the operation of the cutoff device to sever the stock and rewind saidtorsion spring.

6. In a metal working machine, power means for advancing a strip of stock along a predetermined path of travel, a revoluble cutoff device supported to one side of the path of travel of the stock and having a portion movable across the path of travel of the stock to sever the latter, a torsion spring having one end operatively connected to the cutoff device for rotating the latter, latch means normally preventing operation of the spring to rotate the cutoff device and releasable in timed relation to advancement of the stock, means for discontinuing the operation of the power means prior to engagement of the cutoff device with the stock and for rendering said power means operative after the stock is severed, and means operated by the power means for rewinding said torsion spring.

7. In a metal working machine, power means for advancing a strip of stock along a predetermined path of travel, a revoluble cutoff device supported to one side of the path of travel of the stock for movement in the direction of advancement of the stock and having a portion movable across the path of travel of the stock to sever the latter, avtorsion spring having one end operatively connected to the cutoff device for rotating the latter to sever the stock, latch means normally preventing operation of the torsion spring to rotate the cutoff device, means for moving the cutoff device in the direction of advancement of the stock, and mean operated by the cutoff device upon movement thereof in the direction of advancement of the stock to release said latch means and discontinue the operation of the power means.

8. In a metal working machine, means for advancing a strip of stock along a predetermined path of travel, a cut-off device supported to one side of the path of travel of the stock for movement in the direction of advancement of the stock, a member carried by the cut-off device and movable across the path of travel of the stock to sever a portion of the stock from the remainder thereof, a lever supported for swinging movement and having one end abutting the cut-off device,

means for swinging the lever in a direction to move the cut-off device in the direction of advancement of the stock, and means for rotating said member during movement of the cut-01f device in the direction of advancement of the stock to sever the latter.

9. In a metal working machine, means for advancing a strip of stock along a predetermined path of travel, a cut-01f device supported to one side of the path of travel of the stock for movement in the direction of advancement of the stock, a member carried by the cut-off device and movable across the path of travel of the stock to sever a portion of the stock from the remainder thereof, a lever supported for swinging movement and having one end abutting the cut-ofl' device, means for swinging the lever in a direction to move the cut-off device in the direction of advancement of the stock, means rendered operative by movement of the cut-ofi device in the direction of advancement of the stock for rotating said member to sever the stock, and means for returning the cut-off device upon completion of severing operation.

HOMER G. KELLOGG.

FRANK P. SIMS. 

